116 lines
4.9 KiB
C
116 lines
4.9 KiB
C
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/* ----------------------------------------------------------------------------
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* ATMEL Microcontroller Software Support
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* ----------------------------------------------------------------------------
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* Copyright (c) 2008, Atmel Corporation
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the disclaimer below.
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*
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* Atmel's name may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ----------------------------------------------------------------------------
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*/
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//------------------------------------------------------------------------------
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// Headers
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//------------------------------------------------------------------------------
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#include "pit.h"
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#include <board.h>
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//------------------------------------------------------------------------------
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// Exported functions
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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/// Initialize the System timer for a period in <20>second with a system clock
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/// freq in MHz
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/// \param period Period in <20>second.
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/// \param pit_frequency System clock frequency in MHz.
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//------------------------------------------------------------------------------
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void PIT_Init(unsigned int period,
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unsigned int pit_frequency)
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{
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AT91C_BASE_PITC->PITC_PIMR = period? (period * pit_frequency + 8) >> 4 : 0; // +8 to avoid %10 and /10
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AT91C_BASE_PITC->PITC_PIMR |= AT91C_PITC_PITEN;
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}
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//------------------------------------------------------------------------------
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/// Set the PIT Periodic Interval Value
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//------------------------------------------------------------------------------
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void PIT_SetPIV(unsigned int piv)
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{
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AT91C_BASE_PITC->PITC_PIMR = piv | (AT91C_BASE_PITC->PITC_PIMR & (AT91C_PITC_PITEN | AT91C_PITC_PITIEN));
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}
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//------------------------------------------------------------------------------
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/// Enable the PIT
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//------------------------------------------------------------------------------
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void PIT_Enable(void)
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{
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AT91C_BASE_PITC->PITC_PIMR |= AT91C_PITC_PITEN;
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}
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//----------------------------------------------------------------------------
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/// Enable PIT periodic interrupt
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//----------------------------------------------------------------------------
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void PIT_EnableIT(void)
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{
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AT91C_BASE_PITC->PITC_PIMR |= AT91C_PITC_PITIEN;
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}
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//------------------------------------------------------------------------------
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/// Disable PIT periodic interrupt
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//------------------------------------------------------------------------------
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void PIT_DisableIT(void)
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{
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AT91C_BASE_PITC->PITC_PIMR &= ~AT91C_PITC_PITIEN;
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}
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//------------------------------------------------------------------------------
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/// Read PIT mode register
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//------------------------------------------------------------------------------
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unsigned int PIT_GetMode(void)
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{
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return(AT91C_BASE_PITC->PITC_PIMR);
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}
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//------------------------------------------------------------------------------
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/// Read PIT status register
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//------------------------------------------------------------------------------
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unsigned int PIT_GetStatus(void)
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{
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return(AT91C_BASE_PITC->PITC_PISR);
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}
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//------------------------------------------------------------------------------
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/// Read PIT CPIV and PICNT without ressetting the counters
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//------------------------------------------------------------------------------
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unsigned int PIT_GetPIIR(void)
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{
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return(AT91C_BASE_PITC->PITC_PIIR);
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}
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//------------------------------------------------------------------------------
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/// Read System timer CPIV and PICNT without ressetting the counters
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//------------------------------------------------------------------------------
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unsigned int PIT_GetPIVR(void)
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{
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return(AT91C_BASE_PITC->PITC_PIVR);
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}
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